'Swear' in the Bible

On that day five cities in the land of Egypt will speak the language of Canaan and swear loyalty to the Lord of Hosts. One of the cities will be called the City of the Sun.

By Myself I have sworn;Truth has gone from My mouth,a word that will not be revoked:Every knee will bow to Me,every tongue will swear allegiance.

“Listen to this, house of Jacob—those who are called by the name Israeland have descended from Judah,who swear by the name of Yahwehand declare the God of Israel,but not in truth or righteousness.

Whoever is blessed in the landwill be blessed by the God of truth,and whoever swears in the landwill swear by the God of truth.For the former troubles will be forgottenand hidden from My sight.